//           # retainVersions: 5 # keep the latest 5 versions of the object including delete markers.
//
//   notify:
//     endpoint: https://notify.endpoint # notification endpoint to receive job completion status
//     token: Bearer xxxxx # optional authentication token for the notification endpoint
//
//   retry:
//     attempts: 10 # number of retries for the job before giving up
//     delay: 500ms # least amount of delay between each retry

}

func initAllSubsystems(ctx context.Context) {
	// Initialize notification peer targets
	globalNotificationSys = NewNotificationSys(globalEndpoints)

	// Create new notification system
	globalEventNotifier = NewEventNotifier(GlobalContext)

	// Create new bucket metadata system.
	if globalBucketMetadataSys == nil {

{!../../docs_src/background_tasks/tutorial001.py!}
```

`.add_task()` 📨 ❌:

* 📋 🔢 🏃 🖥 (`write_notification`).
* 🙆 🔁 ❌ 👈 🔜 🚶‍♀️ 📋 🔢 ✔ (`email`).
* 🙆 🇨🇻 ❌ 👈 🔜 🚶‍♀️ 📋 🔢 (`message="some notification"`).

## 🔗 💉

⚙️ `BackgroundTasks` 👷 ⏮️ 🔗 💉 ⚙️, 👆 💪 📣 🔢 🆎 `BackgroundTasks` 💗 🎚: *➡ 🛠️ 🔢*, 🔗 (☑), 🎧-🔗, ♒️.

**FastAPI** 💭 ⚫️❔ 🔠 💼 & ❔ 🏤-⚙️ 🎏 🎚, 👈 🌐 🖥 📋 🔗 👯‍♂️ & 🏃 🖥 ⏮️:

	for _, arn := range globalLambdaTargetList.List(globalSite.Region()) {
		arnMsg += color.Bold(fmt.Sprintf("%s ", arn))
	}
	logger.Startup(arnMsg + "\n")
}

// Prints bucket notification configurations.
func printEventNotifiers() {
	if globalNotificationSys == nil {
		return
	}

	arns := globalEventNotifier.GetARNList()
	if len(arns) == 0 {
		return
	}

			Queries("versioning", "")
		// GetBucketNotification
		router.Methods(http.MethodGet).
			HandlerFunc(s3APIMiddleware(api.GetBucketNotificationHandler)).
			Queries("notification", "")
		// ListenNotification
		router.Methods(http.MethodGet).
			HandlerFunc(s3APIMiddleware(api.ListenNotificationHandler, noThrottleS3HFlag, traceHdrsS3HFlag)).
			Queries("events", "{events:.*}")

	      <Event>s3:ObjectCreated:Put</Event>
	   </CloudFunctionConfiguration>
	   <TopicConfiguration>
	      <Topic>arn:aws:sns:us-west-2:444455556666:sns-notification-one</Topic>
	      <Event>s3:ObjectCreated:*</Event>
	  </TopicConfiguration>
	</NotificationConfiguration>
	`)

* Любое упорядоченное количество аргументов, которые принимает функция (`email`).
* Любое количество именованных аргументов, которые принимает функция (`message="some notification"`).

## Встраивание зависимостей

	cred, _, _ = getReqAccessKeyV4(r, region, serviceS3)
	if cred.AccessKey == "" {
		cred, _, _ = getReqAccessKeyV2(r)
	}
	return cred
}

// Extract request params to be sent with event notification.
func extractReqParams(r *http.Request) map[string]string {
	if r == nil {
		return nil
	}

	region := globalSite.Region()
	cred := getReqAccessCred(r, region)

	principalID := cred.AccessKey

						</ul>
					</div>
				</div>
			</nav>
		</header>

		<main id="content" class="container">
			<h2>
				<la:message key="labels.advance_search_title" />
			</h2>
			<div class="notification">${notification}</div>
			<div>
				<la:info id="msg" message="true">
					<div class="alert alert-info">${msg}</div>
				</la:info>

* Eine beliebige Folge von Argumenten, die der Reihe nach an die Taskfunktion übergeben werden sollen (`email`).
* Alle Schlüsselwort-Argumente, die an die Taskfunktion übergeben werden sollen (`message="some notification"`).

## Dependency Injection